Why you should quit weed: The hidden dangers of chronic cannabis use

Is weed addictive?

Yes. While most people who try cannabis never develop a problem with it, it’s not uncommon for regular cannabis users to become dependent on it. For many, occasional use stays occasional. But for around one in five people who use cannabis, a recreational habit eventually develops into cannabis use disorder (CUD), and for those people, the damage can run deep and take years to become visible.

This article is for people in that group, or people who suspect they might be heading there. If cannabis has become a daily or near-daily part of your life and you’ve noticed it taking up more space than you’re comfortable with, what follows is a frank look at what the research shows about the risks of regular use.

How does cannabis addiction develop?

Most people who become addicted to cannabis don’t set out to use it daily. The habit develops through a series of small decisions, each of which seems reasonable at the time.

In the early stages, cannabis offers a sense of ease, heightened enjoyment of food or music, reduced anxiety — a reliable way to unwind. For people who struggle with stress or low mood, those effects can feel genuinely helpful. That’s part of what makes weed easy to lean on.

Over time, though, tolerance changes the experience. The enhancement gives way to numbing: cannabis becomes less about feeling better and more about not feeling worse. At that point, cannabis has become a floor: the baseline without which everyday life feels unbearable.

The frequency of use is the clearest early signal. Daily or near-daily use carries a substantially higher risk of cannabis use disorder. A 2024 study found that addiction risk compounds with both frequency and the potency of what’s being consumed. The products widely available today contain significantly higher concentrations of THC than those of previous decades, which means the risk attached to daily use is not what it was twenty years ago.

What does cannabis do to your social life?

Heavy cannabis use erodes social life through two overlapping processes. For people with underlying anxiety, it reinforces avoidance: the short-term ease of staying home compounds into a contracting circle of friendships and activities. And for people in close relationships, it creates a perceptual gap: daily users tend to rate their partnerships more positively than their partners do, missing signs that the relationship has changed.

Social anxiety and cannabis withdrawal

For many people, cannabis appears to help with anxiety and low mood, at least at first. A 2023 study examining cannabis use disorder and social anxiety found that cannabis use disorder is highly prevalent among people with social anxiety disorder, and a 2022 meta-analysis on cannabis use and social anxiety in young adults found a significant association between problematic cannabis use and social anxiety more broadly. The direction of that relationship isn’t always straightforward, but for many daily users, cannabis and social avoidance reinforce each other.

When social situations feel harder, the temptation to cancel, stay home, and spend the evening stoned is obvious. Those decisions compound. Friendships need consistent investment to survive, and an addiction that makes you unreliable and disinclined to show up will erode them.

Relationships and chronic cannabis use

The impact on close relationships tends to be particularly significant. A 2022 study on relationship perceptions among cannabis users found that people who use cannabis more frequently often misjudge the quality of their own relationships: they perceive things as going better than their partners do, show less effective conflict behaviour, and are often unaware of the gap. Partners of daily users can feel neglected and disconnected in ways the cannabis user doesn’t register.

Cannabis use disorder also tends to narrow a person’s social world. DSM-5 criteria for cannabis use disorder include giving up activities that once mattered to the user, or pulling back from them significantly. For many daily cannabis users, that means a gradual retreat from hobbies, social engagements, and interests that aren’t compatible with constant use.

The effect of cannabis on your career and finances

Heavy cannabis use carries compounding economic consequences that extend beyond the financial. The direct cost of cannabis, reduced work performance, and diminished earnings are the measurable parts, and most daily weed users don’t do this calculation. Moreover, research on long-term heavy cannabis users consistently links sustained use to lower life satisfaction and a narrower range of achieved outcomes than existed before the habit took hold.

Regular weed use can impact work performance and increase absenteeism

A 2024 study using national survey data from 46,499 US adults found that cannabis use and cannabis use disorder are significantly associated with workplace absenteeism among full-time employed adults. Cannabis doesn’t impair performance only while someone is actively intoxicated. The motivation and capacity to show up consistently is affected over time.

A different 2024 study examining cannabis use and academic performance in college students found that more frequent use was associated with higher rates of procrastination and lower grade point averages, even after controlling for other factors. 

Research consistently documents the amotivational effects of heavy cannabis use: reduced drive, difficulty initiating tasks, and lowered self-efficacy. People who’ve gone through heavy use describe the same pattern.

The financial cost of weed

Heavy cannabis use carries a direct financial cost that tends to go unexamined. Daily users in South Africa can spend several thousand rand per month on cannabis. Over years, that figure amounts to a significant sum. Combined with reduced income from underperformance or instability at work, the compounding financial effect can be substantial.

Heavy cannabis use can negatively impact life satisfaction over time

A case-control study of long-term heavy cannabis users found they scored significantly lower on both quality of life and satisfaction measures than matched controls. A separate study examining life satisfaction and cannabis use in young adults found a consistent negative association. What both studies describe, and what many people who’ve stopped heavy cannabis use report, is a process of progressive contraction: fewer experiences, less growth, a narrower range of possibilities than existed before the habit took hold.

The mental health trap: How cannabis stops helping you feel better

For many people, the decision to use cannabis daily starts as an attempt to manage something: anxiety, low mood, stress, or difficulty sleeping. The short-term relief it delivers makes the habit feel like a reasonable solution. With sustained use, the brain adapts to having the substance regulate its emotional state, and what started as relief becomes maintenance: a way of staying functional rather than feeling better.

Why weed seems to help your mental health at first

Cannabis’s initial appeal for many people includes genuine short-term relief. A 2020 review of the anxiogenic (anxiety-causing) and anxiolytic (anxiety-lowering) properties of cannabis found that lower doses can reduce anxiety. Additionally, a 2018 study tracking real-time mood effects of weed found that people using cannabis reported reduced anxiety, depression, and stress in the hours after use. For someone already struggling with their mental health, that kind of relief that kind of relief makes the habit feel justified.

The problem is that while weed might offer temporary emotional relief, regular cannabis use can erode the brain’s capacity to regulate emotion without external assistance. Over time, what felt like relief becomes dependency: the absence of cannabis produces the same distress the substance once seemed to resolve.

Is weed bad for your mental health? 

Yes, there’s strong evidence to suggest that heavy cannabis use has a profoundly negative impact on your mental health over time.

A 2019 review on the effects of cannabis in people with mental illness found consistent evidence that cannabis use is associated with a range of mental health difficulties, including worsening anxiety and depression with sustained use. 

A 2023 umbrella review of meta-analyses examining data from both randomised controlled trials and observational studies found that cannabis use carries meaningful psychiatric risks, including a dose-dependent relationship with mood disorders.

Additionally, a 2024 systematic review on cannabis and mood disorders found that cannabis use is associated with “increased depressive and manic symptoms in the general population in addition to an elevated likelihood of developing MDD (major depressive disorder) and BD (bipolar disorder)”, as well as a worse prognosis for mood disorders, including higher rates of relapse and more severe symptoms over time.

The mechanism is the problem: cannabis doesn’t just suppress negative emotions temporarily. With chronic use, it can blunt the emotional processing capacity that allows you to work through difficult feelings. What gets suppressed doesn’t disappear; the unprocessed feelings accumulate. 

Many people who’ve gone through cannabis drug use describe a point at which the substance stops providing relief at all, while withdrawal symptoms (anxiety, irritability, disturbed sleep, lowered mood) make it feel impossible to stop, especially while dealing with the stressors of everyday life.

What happens when you stop using weed?

The research on mental health outcomes after quitting marijuana is broadly encouraging. A 2022 study on 28 days of cannabis abstinence found meaningful improvements in attention and cognitive function among people with co-occurring depression. Clinical reports and longer-term follow-up studies consistently suggest that sustained abstinence is associated with improvement in mood, anxiety, and general functioning, particularly when supported by appropriate treatment.

Here’s what the immediate aftermath of quitting weed typically looks like:

• Days 1–3: Peak symptoms. Irritability, anxiety, sleep disruption, reduced appetite, and restlessness are most intense in the first three days after stopping. For heavy daily users, this phase can feel destabilising, particularly if cannabis had been functioning as a sleep aid or mood regulator.
• Days 4–14: Acute symptoms begin to ease, though sleep disturbance often outlasts the other symptoms. Appetite typically returns during this period.
• Weeks 2–4: Mood and anxiety begin to stabilise for most people. Cognitive fog (difficulty concentrating, slower processing) remains present for many but starts to lift.
• Months 1–3: Most people see meaningful improvements in memory, attention, and motivation. For long-term heavy users, cognitive recovery can continue beyond the three-month mark.
• Beyond three months: Mood and anxiety in many people return to or below their baseline before quitting. For those with underlying mental health conditions, this phase often requires additional support.

The timeline describes a typical arc. People who’ve used cannabis heavily for a decade won’t recover at the same pace as someone who’s been using daily for a year. For those with underlying anxiety or depression that cannabis had been partly suppressing, the first weeks after stopping can be difficult enough to need clinical support. That’s not a reason to avoid stopping weed; it’s a reason to consider getting help.

Cannabis use in South Africa

Cannabis (dagga) has a long history of use in South Africa, and the legal landscape has changed significantly in recent years. The 2024 Cannabis for Private Purposes Act decriminalised private adult use and home cultivation, which has contributed to greater social acceptance and more widespread use across age groups.

What the law change does not alter is the pharmacology. Cannabis that’s legally available for personal use carries the same dependency risk as any other form, and in many cases the THC concentration in products available today is considerably higher than in those of previous decades.

According to the SACENDU Research Brief for January to June 2025 (published May 2026), cannabis accounted for 37% of all specialist treatment admissions nationally in the period January–June 2025, up from 33% in the second half of 2024. Cannabis is the leading substance presenting at South African treatment centres, ahead of alcohol (24%), methamphetamine (tik), and all other substances.

Regionally, cannabis accounts for between 24% (Western Cape) and 43% (Northern Regions) of admissions, with Gauteng at 41% and the Eastern Cape at 36%. 

The mean age at admission for a cannabis-related problem is 22 years. Among people aged 18 and younger, cannabis accounts for 73% of all treatment admissions nationally, ranging from 55% in the Northern Region to 80% in Gauteng.

Treatment admissions don’t capture the full extent of cannabis use disorder in the population. The figures represent the point at which consequences became impossible to manage without outside help.

Signs that cannabis use has become a problem

Cannabis use disorder is a recognised clinical condition. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) identifies specific criteria for diagnosing cannabis use disorder, several of which map directly onto the experiences heavy users often describe:

• Using cannabis more frequently, in larger doses, or for longer than you intended
• Repeated unsuccessful attempts to cut down or stop smoking weed (or other ingestion methods)
• Spending a significant amount of time obtaining, using, or recovering from cannabis
• Cravings or strong urges to use
• Failing to meet major obligations at work, home, or school because of weed use
• Continuing to use despite persistent social or interpersonal problems it’s causing
• Giving up or reducing activities that were previously important to you
• Using dagga in situations where it’s physically hazardous
• Continuing to use weed despite knowing it’s causing or worsening a physical or psychological problem
• Developing weed tolerance: needing to consume more of the herb to achieve the same effect
• Experiencing weed withdrawal symptoms when stopping cannabis

Two or three of these criteria met over a twelve-month period indicates mild cannabis use disorder. Four or five indicates moderate. Six or more indicates severe.

A straightforward self-check: Stop using weed entirely for four weeks, starting today. If that feels impossible, or if you make it a few days and find yourself finding reasons why today was an exception, the pattern itself is the answer.

Getting help for cannabis addiction in South Africa

Cannabis use disorder responds well to treatment, particularly when someone engages with it before consequences have become severe. The most effective approaches combine psychological treatment with recovery support and, where relevant, treatment for co-occurring mental health conditions. 

Many people who seek help for cannabis use disorder also have underlying anxiety, depression, or trauma that cannabis was partly masking. Treating both conditions together through a dual diagnosis approach produces substantially better outcomes than addressing either in isolation.

Houghton House is one of only a handful of drug rehabilitation centres that is also a also fully licensed private psychiatric hospital. Located in Randburg, Johannesburg, we offer both inpatient and outpatient treatment for addiction, including cannabis use disorder. We’re equipped to provide the clinical depth dual diagnosis cases require, with medical and psychiatric support available on site, individual and group therapy, and a personalised aftercare programme. 

If you’re uncertain whether what you’re experiencing constitutes a problem, our admissions team can speak with you confidentially before any commitment is made. The line is open 24 hours: 011 787 9142.

Substance use disorders are prescribed minimum benefits under South African medical aid legislation, which means all registered medical aids are legally required to cover addiction treatment, regardless of what plan you’re on.

If you don’t have medical aid and private treatment isn’t an option, our resources page lists government-funded and subsidised rehabilitation centres across South Africa, including options in Gauteng, the Western Cape, KwaZulu-Natal, and other provinces.

Frequently asked questions about cannabis use and addiction

Is weed addictive?

Yes. Around one in five people who use cannabis develop cannabis use disorder, a recognised clinical condition characterised by cravings, difficulty stopping, and withdrawal symptoms. The risk is substantially higher among daily users and those using high-potency products.

How long does cannabis withdrawal last?

Acute symptoms, including irritability, anxiety, disrupted sleep, and reduced appetite, typically peak in the first three days and ease within one to two weeks. Sleep disturbance often outlasts the other symptoms. Cognitive effects, such as difficulty concentrating and slower recall, can persist for weeks to months in long-term heavy users.

Can weed cause anxiety?

Yes, with sustained use. Cannabis can reduce anxiety at lower doses in the short term, but chronic use is associated with increased anxiety over time. For people with an underlying anxiety disorder, heavy use tends to worsen symptoms. Withdrawal also produces anxiety as one of its primary symptoms.

Is cannabis a gateway drug?

Research shows a statistical association between early cannabis use and later use of other substances, but evidence for a direct causal pathway is weak. Most people who use cannabis don’t go on to use other drugs. People who develop cannabis use disorder are at elevated risk of other substance use disorders, but this more likely reflects shared vulnerability factors than cannabis causing the progression.

What are the benefits of stopping weed?

Most people who quit cannabis report improvements in mood, sleep, energy, motivation, and cognitive function within weeks to months. Financial savings are immediate. For people who had been using cannabis to manage anxiety or low mood, the first weeks can feel difficult, but sustained abstinence is associated with lower baseline anxiety and better emotional regulation over time.

How do I know if I’m addicted to weed?

The clearest sign is difficulty stopping. DSM-5 criteria for cannabis use disorder include unsuccessful attempts to cut down, cravings, continued use despite negative consequences, and withdrawal symptoms when stopping. A practical test: try stopping entirely for four weeks. If that feels impossible, or if you keep finding reasons to postpone, that response is informative.

Does quitting weed improve mental health?

For most people, yes. Research consistently links sustained abstinence with improvements in mood, anxiety, and cognitive function. Acute withdrawal can worsen mood in the first one to two weeks, but most people report meaningful improvement within a month. For those with underlying anxiety or depression, improvement often continues over several months.

How long after quitting weed does it take to feel normal?

Most acute withdrawal symptoms ease within one to two weeks. Mood and concentration typically stabilise within a month. For long-term heavy users, full cognitive recovery can take three months or longer. Many people report feeling better than their pre-quitting baseline within three to six months.

What are the long-term side effects of cannabis use?

Heavy, sustained use is associated with cannabis use disorder, increased risk of anxiety and mood disorders, reduced motivation and work performance, and cannabinoid hyperemesis syndrome in a subset of long-term heavy users. People with a genetic predisposition to psychosis face additional risk. Smoking cannabis also carries respiratory risks.

What are the risks of taking cannabis?

Around one in five regular users develop cannabis use disorder. Higher-potency products and daily use both increase that risk. Documented effects of heavy use include worsening anxiety, reduced motivation, impaired memory, and increased risk of psychosis in those with a genetic predisposition.

Can you overdose on weed?

Cannabis can’t cause a fatal overdose the way alcohol or opioids can. The brainstem areas that regulate breathing carry very few cannabinoid receptors, which is why cannabis doesn’t suppress respiration. Taking far too much can still make you acutely unwell, and the experience can be frightening enough to send people to an emergency room.

Symptoms of acute overconsumption (sometimes called “greenies” or “greening out”) include severe anxiety or panic, a racing heart, nausea and vomiting, confusion, and in some cases temporary psychotic symptoms such as paranoia or hallucinations. These usually settle within several hours as the THC clears. Edibles account for a disproportionate share of these cases, because the effects take one to two hours to appear and people take more in the meantime.

Most cases resolve on their own. Contact a doctor or go to casualty if any of the following apply:

• Chest pain, at any point, without waiting to see whether it passes
• Vomiting that continues beyond a few hours, or that stops you keeping fluids down
• Paranoia, hallucinations, or confusion still present after 24 hours

Otherwise, the safest approach is a quiet space, water, and someone to stay with you until the effects wear off.

What triggers cannabinoid hyperemesis syndrome?

Cannabinoid hyperemesis syndrome (CHS) is caused by prolonged, heavy cannabis use, typically over several years. The exact mechanism isn’t fully understood, but it involves overstimulation of cannabinoid receptors in the gut. Not all heavy users develop it, and what predisposes some people and not others isn’t well established.

What are the first signs of cannabinoid hyperemesis syndrome?

CHS typically develops in three phases. In the early phase, which can last months to years, people experience recurring morning nausea and abdominal discomfort. The hyperemetic phase involves intense, cyclical vomiting lasting 24 to 48 hours at a time. A distinctive feature is compulsive hot showering or bathing, which temporarily relieves the nausea. CHS is frequently misdiagnosed because the connection to cannabis use isn’t always identified.

How long does it take for cannabinoid hyperemesis syndrome to go away?

Symptoms typically resolve within days to weeks of stopping cannabis entirely. Any continued use, even occasional, prolongs or restarts the cycle. Stopping cannabis is the only intervention that reliably resolves CHS.